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1.
Summary A field experiment was conducted using15N-labelled urea on a Reddish Brown Lateritic (Peleustult) soil. Growing two crops on flat land and on soil ridges of 15 cm
height produced similar comparative effects from fertilizer on maize. However, fertilizer applied by broadcasting on maize
with a 50 cm effective band followed by incorporating was more useful to mungbean than that applied by banding below the cereal
seed rows when crops were grown on flat land. The reverse was observed when crops were grown on ridges. It was deduced that
the maize cultivar was not likely to affect comparative efficiencies of fertilizer.
For fertilizer application at sowing, broadcasting in 50 cm maize effective band followed by incorporating was slightly superior
to banding below maize seed rows. Side-dressing of fertilizer to maize at 4 weeks after sowing was superior to application
at sowing. Evenly-split application, at sowing and at 4 weeks after sowing, was either only slightly superior or comparable
to non-split application by banding below maize seed rows at sowing, depending on placement method of the first application.
Soil moisture status as a possible factor rendering discrepancy in the comparative efficiencies obtained by different authors
is discussed. 相似文献
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M. Masuyama 《Biometrical journal. Biometrische Zeitschrift》1991,33(6):725-733
A mathematical model of the linearized growth curve and its physiological interpretation by the introduction of proper age, which is proportional to the chronological age, are presented here. In the second phase, but not in the first phase, this constant of proportionality is highly correlated with the age at menarche. 相似文献
5.
The effects of defoliation treatments on plant growth in sunflower (Helianthus annuus) were studied in the field. Four defoliation treatments, 0 (control), 37.4, 56.1 and 93.4% of the total leaf dry weight,
were applied to plants that had small third leaves. Decreased leaf weight/whole plant weight (F/W) ratios in defoliated plants
rapidly recovered to almost the same ratio as that observed in the control within 12 to 16 days after defoliation according
to the degree of defoliation. The mechanism involved in the recovery of the F/W ratio in defoliated plants mainly consisted
of three parameters: enhancement of (1) carbon distribution ratios in the leaves, (2) photosynthetic activity in the remaining
leaves, and (3) retranslocation of carbon from the stem and/or roots to leaves.
Inhibitive effects of defoliation on relative growth rate and net assimilation rate were seen at an early stage, but subsequently
both rates became larger in defoliated plants than in controls. Defoliated plants tended to show rapid development and expansion
of new leaves, and to show increased specific leaf area and protein synthesis in individual leaves. The sugar content of leaves
in defoliated plants was higher than that in controls, while the content in both stem and roots was lower. These responses
seem to be advantageous for development of the photosynthetic system. Heights of defoliated plants were clearly depressed
according to the degree of defoliation, and this was attributed largely to differences in the elongation rates of the internodes
resulting from defoliation. 相似文献
6.
Noninformative priors for one parameter of many 总被引:4,自引:0,他引:4
7.
A sensitive and specific enzyme-linked immunosorbent assay (ELISA) for cholecystokinin octapeptide sulfate (CCK-8S) has been developed using N-terminal specific antibody for CCK-8S. In this assay CCK-8S coupled with poly-L-Glu (CCK-poly-Glu), which is adsorbed on a solid phase, competes with CCK-8S for the binding sites of rabbit anti-CCK antibody, and the complex of the immobilized antibody and CCK-poly-Glu is measured using goat anti-rabbit immunoglobulin G conjugated with horseradish peroxidase. The total time for completion of the assay is less than 24 h. Near 50% bound levels, the intraassay coefficient of variation is 5.2-6.2% and the interassay coefficient of variation is 5.9-8.5%. This assay is sensitive enough to detect 9 pg of CCK-8S, and the data from rat brain regions using this ELISA are very similar to the data from those using radioimmunoassay (RIA). Therefore, this ELISA is simpler and more rapid in comparison with conventional RIA. In the preliminary experiments, we applied this method for determination of CCK content in the brain regions of adult rats treated with 6-hydroxy-dopamine or in newborn rats subjected to anoxia, and showed that this system is applicable to detection of changes of endogenous CCK content. 相似文献
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Estimation in change-point hazard rate models 总被引:1,自引:0,他引:1